It seems to me, man has changed the planet and thus the weather and I don’t see that being reversed.  I am not a very optimistic person, I guess. But the earth will survive; life will adapt,some species may perish (even man) but others will take their place. I see it as part of a natural process.  All life, as we know it, may at some time become extinct on earth but it will be a process (though aided by man) out of the control of man.  Man’s belief in his power, both for creativity and destruction, is, to me, arrogant and delusional.  That is not to said that we should not be striving to correct the damage we’ve done and feeling great shame for what we have allowed to take place.